Crank.



M. T. CHAPMAN.

CRANK.

APPLICATION HLEL DEC. 14, 1914.

1 1 86,547. Patented June 13, 1916.

mnmnl WITNESSES: E /E. 3W

MATTHEW '1. CHAPMAN, F AURORA, ILL-131N615, ASSIGNOE WORK- fiU'liQRA, ILLINOIS, A GQREOIRIATION OF ILLINOIS.

CRANK.

inona-u Original application filed September 30, 1911, Serial No. 652,082.

Serial No. 87212153.

To all whom it may concern:

Be it known that I. ivili'rrnaw T. (nar- MAN, a citizen of the United States, resid ing at Aurora, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Cranks, of which the following is a specification. rct'- crence being had to theaccompanyingdrawings.

This invention relates to cranks, for its object the provision of a new a ad has and 1mproved form and arrangement whereby a the to the said arm 11.

very compact and very strong structure is attained.

The preferred means by which I have accomplished my object.) are illustrated in the accompanying drawings and are hereina'tter specifically described. That which i believe to be new is set forth in the claims.

in the drawings-Figure 1 is a view, partly in section. of my improved crank: Fig.- 2 is a section taken at line 2-). of Fig. 1; Fig. 3 is a vi w. partly in section. showing a slightly modified form: Fig. l is a section taken on line -ll of Fig. 3.

Referring to Figs. 1 and 2, l0-ll indieate crank-arms joined at their outer ends by a wrist-pin 12. and provided at their other ends with alined axles or supporting members 13-l'-l, respectively, in the construction shown all of the parts so far in ferred to being made integral with each. other. Mounted upon the cranlearm ll in concentric position relative to the alined supportingmembers 13 1-1 and surroumling said arm 11 is a drivinggear 15. the hub 16 ot' whiclrgear is mounted upon the supporting member 14. Bolts 17 are provided passing through suitable openings in the web of the geaand the crank-arm it for securing said gear firmly in position rela- Asbest shown in big. 1, a stud R is provided, formed integrally with the rm 11 in alinement with the wrist-pin 12, passing through a. suitably located opening through the gear 15, said stud being screw-threaded on #itsouter end and provided with a nut 19 for assisting in holding the gear in position. l

In Figs. 3 and fl, which show a modifica Specification of Letters Iatent.

Patented June 113, rats. Divided and'this application filed December tion .01 the crank and gear, the correspond mg parts are indicated by the same reference characters as in Figs. 1 and 2 but with the addition of an exponent :i." In the construction here shown. an arm :20 is provided broader than the arm 11 ot' the other construction and secured about its entire periphery by bolts ill to the gear 15. The concentrieally-positioncd support at that end of the shaft to which the gear 15 is attached is made separate 'lroni the arm 20 in the form of an axle 22:3 which is keyed or otherwise fixed in position in suitable openmgs in the arm zlt'laud the gear 15? in any approved manner. By this construction the assembling of the parts can be more readily accomplished.

By the expedient "of mounting the driving means for the shaft surrounding or in transverse aliitemcnt with one of the crankarms, '1 have provided not only a very strong construction but one the maximum of compactness.

While I have shown only one driving gear mounted upon one of the crank-arms, it will be understood that it do not restrict myself to the use of a driving gear upon only one oi the arms except as hereinafter specifically claimed. the important feature being that the driving means is located in transverse alincment with the arm.

This application is filed as a division of my application. Serial Flo. (352.0112. pumping lllzlt'llllltl), filed t eptember 50, 1911.

That which i claim as my invention. and desire to secure by Letters Patent, is,-

l. A crank comprising in combination two crank-arms. a wrist connectionbetween said arins,alinedsupports for said crank-arms, a. stud projecting from the outer face ot'oue of said craulearms in alinemeut with the wrist. a gear mounted on said stud mncentrically oi the axis oi rotation of said crank. and a not secured by :au-cw-threiuls upon said stud for holding the gea in position.

2. A crank comprising in combination two crank-arms. a wrist connection between said arms, a supporting member tor one of said crank-arms, an axle mounted in a suitable opening in the other of said crank-arms in TO THE AMERICAN WELL g aw y? alinement with said supporting member, means for securing said gear in position stud projgcting from the ute face of sqid. upon said arm. 1at-men t10ned crank-21pm 1n allnexnent wlth T Tu CHAPMAN szud must, a gear mounted on sand arm E5 concentrically of the axis of rotation of Witnessps;'

-said crank and having openings through R. D. MAIIAFFEY,

which said stud and said axle project, and C. B. SPEIR. 

